1982 Cadillac DeVille Coupe Deville 4.1 HT-4.1 V8 from North America

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The HT-4100 engine in this car is known to be extremely unreliable if not properly cared for, mainly if one fails to change the coolant on a regular basis. The cams are known to go flat, and main bearings are known to wear prematurely.

My car has been good to be other than a leaking valve cover gasket, and a faulty oxygen sensor and throttle body vacumn (which took forever to diagnose). I take extremely good care of it though, and drive it very slow and very easy. The car is underpowered to say the least (125 hp on 82' models, pushing a 3783lb. car). The ride is exceptionally comfortable, though handles poorly in the snow. Handling is very smooth, and you feel very little of the road.

20th Jul 2004, 01:07

I was wondering if you could help me out? I have overheating problems with my 82 coupe and I was wondering if you knew anything about the engines about them or if you would know what to do? If so e-mail me back at CoUpEoNDuBz@yahoo.com

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Considering the price ($1200.00) I paid, I find that the few repairs or fixes I have made have been worth the cost. So far the car is running quite well except for an erratic engine speed at idle. I believe there may be a problem with the EGR control valve.

10th Mar 2009, 11:37

My erratic engine idle was caused by worn accelerator shaft ports in the throttle body, causing the TPS to intermittently set at a different angle. I had the ports filled in and re bored to spec, and a long extensive and expensive gremlin chase ended.